The previous commit "Automatically sync editor with its textarea" was
found a not good solution as the onchange event is triggered way less
often than needed for our needs. So this reverts commit 34321d49.
Instead, we add a hack to the formslib so that when there are some
TinyMCE editors used at the page, we explicitly save them before
triggering the form validation. This simply calls save() on all editors
on the page - see the API reference:
http://archive.tinymce.com/wiki.php/API3:method.tinymce.triggerSave
Having TinyMCE hardcoded like this on this core level does not make me
happy. But it seems to be most effective solution for now (and
definitely more efficient than the previous solution). Plus there is a
precedence - we already use window.tinyMCE in formchangechecker.js YUI
module, for example.
Probably as a result of recent changes in the way how forms client side
validators are trigerred (MDL-52826), the field validator has been
triggered before the underlying textarea's values property is updated by
TinyMCE. This led to marking such a field as "required" even if the
value is provided.
Inspired by http://stackoverflow.com/questions/2122085/
this patch adds a new onchange callback that automatically keeps the
underlying textarea synced with the editor iframe. Relevant API docs:
http://archive.tinymce.com/wiki.php/Configuration3x:onchange_callback
I was also trying to call the save() method via the editor's onSubmit
method but that one seems to be also triggered only after the validator.
We apply this only on touchend and not touchstart or touchmove. The
location is not guaranteed until the end of the gesture, and there's no
need to keep applying focus on every move.
